Got feared by the vampiric researcher just off the ballroom (even with paladin Fearless AA) and sat there for about 30-45 seconds in the middle of them, while my fear ran its course. When it finally left, the reasearcher came running back up, and before she even reached me, I was hit about 5-6 times for 1948 non-melee damage from these dancers.
To make a long story short, don't fight near these guys, they pack quite the punch, rez in the guild lobby please!